Uni-T UT331+ Temperature and Humidity MeterUni T UT331+ Temperature and Humidity Meter The Uni T UT331+ Temperature and Humidity Meter is a practical tool for measurements ranging from 20C to 70C and 099. 9% RH, combining good accuracy (0. 5C) with a fast response time of approximately 1 second. A memory for up to 299 measurements and the ability to export them via USB allow for convenient data management and analysis of results on a computer. Automatic logging and the MAX MIN function help